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U in (-oo:+oo)
-1/5 = (1/2)*U-(4/3) // - (1/2)*U-(4/3)
4/3-((1/2)*U)-1/5 = 0
(-1/2)*U-1/5+4/3 = 0
17/15-1/2*U = 0 // - 17/15
-1/2*U = -17/15 // : -1/2
U = -17/15/(-1/2)
U = 34/15
U = 34/15
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